I've been happy to buy lenses with Schneideritis because they were cheaper, very happy... at the same price I'd take the one with the best cosmetics... of course.
Here it's shown that Schneider is not alone, also it's seen that the spots are in the inside of the coating applied to the bevel of the lens perimeter, and not generating dust:
https://www.rangefinderforum.com/for...d.php?t=158580
To repair it that coating in the bevel has to be sanded and black paint applied again, but no work is required in the barrel itself. Painting only the bevel solves nothing, as problem is in the inside, the original paint has to be eliminated to reach the spots that are in contact with glass, under black coating.
The real problem is a lens coming without shneideritis but with a faulty shutter
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